I have zero experience in judo (I certainly do not count the one demo I watched).

One of our area's senior instructor is "an old judo guy" (not my words). A number of years ago when preparing for nikyu test, he helped me out with koshinage. He said something to the effect of, 'While the dynamic and application is different, the fundamental principle is the same'. The hip/hara/koshi is used as a rotation point around which uke falls, so you must develop stability while being able to move. How you get there, how much "energy" you use, exact execution is simply a matter of which art you are in.